The Boeing 737-800 is a stretched version of the 737-700. The 737-800 burns 850 US gallons (3,200 L) of jet fuel per hour.
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From this site by Boeing for the B737-800: fuel used for TO and climb = 2,300 kg. From this site: fuel burn at idle of a CFM56 engine = 300 kg/hr, so for the half hour descent two engines burn through 300 kg.
The 737-800 has a maximum fuel capacity of 6,875 gallons, which it carries in fuel tanks in its wings, as seen here, and in a fuel tank located underneath the passenger cabin's midsection. Fully loaded, the jet can fly up to 3,159 miles without refueling.
This aircraft burns 850 gallons of jet fuel per hour, or about 80% of the fuel required by an MD-80 on a comparable flight, even while carrying more passengers than the latter. According to the Airline Monitor, an industry publication, a Boeing 737-800 burns 4.88 gallons of fuel per seat per hour.
Boeing claims the 737 MAX provides 15-20% greater fuel efficiency than its predecessors. A significant contribution to fuel efficiency goes to ultra-efficient LEAP engines. The efficiency of a turbofan engine is typically measured in terms of the consumed fuel per generated thrust.
A plane like a Boeing 747 uses approximately 1 gallon (about 4 liters) of fuel every second. Over the course of a 10-hour flight, it might burn 36,000 gallons (150,000 liters). The 747 burns approximately 5 gallons of fuel per mile (12 liters of fuel per kilometer).
The average Delta Airlines pilot earns $192,000 with top-earners making $526,000. American Airlines pilots earn an average salary of $118,000, with some pilots earning in excess of $700,000.
Traditionally a pilot at a regional airline might start out earning less than $50,000 per year, but get hired on by a major airline and that goes up quickly into the six figures, and well over $300,000 for senior captains flying widebody aircraft overseas. Some earn over $400,000.
Can a 737 land with full fuel? Essentially all airplanes can land with full tanks. For civilian aircraft it's a requirement. But if you land at above the maximum landing weight, you run an increased risk of bending something, and may require a heavy landing inspection before you can fly again.